JP7532046B2 - Image capture device, control method thereof, and image capture system - Google Patents

Description

The present invention relates to a technology for correcting image blur by controlling the drive of an image sensor in an imaging device in which a lens device can be attached to the main body.

Image capture devices with a function to correct image blur caused by camera shake and the like perform image blur correction processing using a detection signal from a shake detection unit such as a gyro sensor, or motion information detected from time-successive captured images. Patent Document 1 discloses a technology for performing image blur correction by moving an image sensor or part of an imaging optical system in a plane perpendicular to the optical axis of the imaging optical system. In controlling image blur correction, information required for image blur correction is exchanged through communication between an interchangeable lens and the camera body, and a process is performed to determine the ratio at which to drive the image sensor and part of the imaging optical system.

Patent No. 4567313

However, a user may use an interchangeable lens manufactured in the past or an interchangeable lens optimized for another system by mounting it on the main body of an imaging device. In this case, if the control unit in the main body of the imaging device cannot receive and transmit information necessary for image blur correction, there is a possibility that the range of the drive control amount of the image sensor cannot be determined due to a lack of information. Therefore, image blur correction is only performed by driving a part of the imaging optical system (correction lens) in the interchangeable lens. In addition, there is a problem with performing image blur correction by driving the image blur correction member provided in the interchangeable lens and the image blur correction member provided in the main body of the imaging device, respectively, without dealing with such a situation of lack of information. In this case, there is a possibility that the brightness of the peripheral part of the captured image cannot be ensured due to the influence of the edge of the image circle where the amount of light is insufficient.
An object of the present invention is to provide an imaging apparatus in which a lens device can be attached to a main body and which is capable of correcting image shake while suppressing deterioration of image quality.

An apparatus according to an embodiment of the present invention is an imaging device to which a lens device can be attached via a mount section, and is equipped with a correction means for performing image blur correction by driving an imaging element, a control means for controlling the drive of the correction means based on detection information from a detection means for detecting shake of the lens device or the imaging device, and a memory means. When the control means cannot acquire maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device, the control means determines a range of the drive control amount of the correction means based on the difference between a length obtained by subtracting a diagonal length related to the imaging range of the image element from a length equivalent to the closest distance from a circle representing an image circle having an image circle diameter corresponding to the lens device, which is assumed to have an image circle center at a position corresponding to the information pre-stored in the memory means, when viewed from the optical axis direction of the imaging optical system of the lens device, to the center of the mount section, and the positioning accuracy when the image element is positioned at the center of the mount section by the correction means, and makes the range of the drive control amount of the correction means larger when the control means can acquire maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device than when the control means cannot acquire maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device .

The present invention provides an imaging device that can mount a lens device to a main body and can perform image blur correction while suppressing degradation of image quality.

FIG. 1 is a diagram illustrating an example of the configuration of an imaging device according to an embodiment of the present invention. 3A and 3B are diagrams illustrating a combination of a lens device and a main body according to the embodiment. 5A to 5C are schematic diagrams illustrating control of image blur correction in the present embodiment. 5 is a flowchart illustrating control of image blur correction in the present embodiment.

Below, an embodiment of the present invention will be described in detail with reference to the drawings. As an example of an imaging system, a lens-interchangeable camera system in which a lens device is attached to the main body of an imaging device and can be used is shown. In an imaging device with an image stabilization function, the calculation and determination process of the image stabilization stroke range (the drive control range of the image stabilization means) according to the combination of the lens device and the main body is explained.

Figure 1 is a schematic diagram showing an example of the configuration of an imaging system according to this embodiment. Figure 1(A) is a central cross-sectional view of the imaging system 1000. Figure 1(B) is a block diagram showing the electrical configuration of the imaging system 1000.

The imaging system 1000 can mount a lens device 2 on a main body (imaging device) 1. The lens device 2 is an interchangeable lens that is mounted on the main body 1 via a mount 5. The interchangeable lens is a lens unit that the user mounts on the main body 1 depending on the purpose of shooting. The mount 5 is a connection member such as a mount block that connects the lens device 2 and the main body 1. The imaging system 1000 is a so-called interchangeable lens type single-lens camera, and is configured so that various interchangeable lenses can be attached and detached via the annular mount 5. Figure 1 shows the optical axis 4 of the imaging optical system 3 of the lens device 2.

The main body 1 includes an image sensor 6 and an image blur correction unit 7. The image blur correction unit 7 performs image blur correction of the captured image by moving or rotating the image sensor 6 in a plane perpendicular to the optical axis 4. The components related to the control performed by the imaging system 1000 will be described with reference to FIG. 1(B).

The main body 1 includes an image sensor 6, an image shake correction unit 7, a camera control unit 8, an image shake correction control unit 9, an image processing unit 10, a memory unit 11, and a shake detection unit 16. The lens device 2 includes an image capturing optical system 3, a lens control unit 13, a memory unit 14, and a shake detection unit 15. When the lens device 2 is attached to the main body 1, the image capturing optical system 3 forms an image of light from a subject, and the image capturing element 6 performs photoelectric conversion on the light image of the subject. Light rays at a shooting angle of view centered on the optical axis 4 of the image capturing optical system 3 pass through each optical member of the image capturing optical system 3 and are formed as a subject image on the image capturing element 6.

The photoelectric conversion section (not shown) included in the image sensor 6 performs photoelectric conversion on the subject image and outputs an electrical signal to the image processing section 10. The image processing section 10 performs development processing, gamma processing, etc. on the image signal output from the image sensor 6, and generates image data in a predetermined image file format. The image data is stored in a non-volatile memory (not shown) by the camera control section 8. The camera control section 8 includes, for example, a CPU (central processing unit), and controls each component of the imaging system 1000 by executing a predetermined program.

The image sensor 6 in the main body 1 can be moved within a plane perpendicular to the optical axis 4 by an image blur correction unit 7. A camera control unit 8 controls the image blur correction unit 7 via an image blur correction control unit 9 based on a detection signal from a shake detection sensor or image motion information (motion vector, etc.) acquired from an image signal from the image sensor 6. For example, there are the following embodiments for acquiring the detection information.
(1) A configuration in which the main body 1 includes a shake detection unit 16 and the lens device 2 includes a shake detection unit 15 .
(2) Either the main body 1 or the lens device 2 has a shake detection unit.
(3) A configuration in which the image processing unit 10 calculates image motion information from the output signal of the imaging element 6 .
(4) A form that combines (1) or (2) with (3).
The shake detection units 15 and 16 are equipped with a shake detection sensor and detect shake applied to the lens device 2 and the main body unit 1. The shake detection sensor is an angular velocity sensor, an acceleration sensor, or the like. When only the above embodiment (3) is applied, the shake detection sensor is not required, and the configuration can be simplified. In either embodiment, the image stabilization control unit 9 controls the drive of the image stabilization unit 7, thereby reducing the effect of unnecessary vibrations caused by the photographer's hand shake, etc., on the captured image.

The image stabilization control unit 9 controls the movement of the image sensor 6 via the image stabilization unit 7. At that time, the image sensor 6 can be positioned at the center of the mount unit 5 with a predetermined positioning accuracy. In this embodiment, information on the positioning accuracy of the image sensor 6 in image stabilization is treated as a design value that represents the process capacity at the time of manufacturing the imaging device, but this is not limited to this, and an individual value at the time of manufacturing for each camera may be used. An individual value is a value unique to each device. The design value or the individual value at the time of manufacturing is held in the memory unit 11 of the main body unit 1.

The camera control unit 8 can communicate with the lens control unit 13 in the lens device 2 via the electrical contacts 12. The electrical contacts 12 are disposed in the mount unit 5, and the camera control unit 8 and the lens control unit 13 transmit and receive power and electrical signals according to a predetermined protocol. In the imaging system 1000 of FIG. 1, the lens control unit 13 performs drive control of optical members and the like via various control units according to the command of the camera control unit 8. For example, when the lens control unit 13 receives a control command signal from the camera control unit 8 according to focus state detection information of the imaging optical system obtained by the image processing unit 10, it performs drive control of the focus lens of the imaging optical system via a focus adjustment control unit (not shown). A focus adjustment operation is performed to focus on the subject by moving the focus lens. The lens control unit 13 also performs light amount adjustment control using an aperture and image blur correction control using an image blur correction lens. In optical image blur correction, for example, control is performed to move an image blur correction lens (shift lens, etc.) constituting the imaging optical system 3 in a plane perpendicular to the optical axis 4.

The storage unit 11 of the main body 1 is composed of a ROM (read only memory) that prestores information necessary for the control performed by the camera control unit 8, and a RAM (random access memory) that can respond to the photographer's selection. For example, the storage unit 11 stores information about interchangeable lenses other than the lens device 2 that existed before the camera system shown in this example was manufactured. The camera control unit 8 can optimize the image processing method and focus detection for each interchangeable lens by using the information stored in the storage unit 11.

The memory unit 14 of the lens device 2 has a similar configuration to the memory unit 11, and stores, for example, optical information and the like required for focus adjustment control performed by the camera control unit 8. The lens device 2 is an interchangeable lens that supports the latest protocol defined in the camera system shown in this example. Therefore, the memory unit 14 stores in advance information indicating where the optical axis 4 or the center position of the total light beam is located relative to the mount unit 5. In other words, the memory unit 14 stores each piece of information as optical axis offset information and maximum offset information of the image circle center. The memory unit 14 also stores information on the image circle diameter that the imaging optical system 3 has on the imaging plane.

Here, we consider a case where an interchangeable lens other than the lens device 2 is attached to the main body 1. This interchangeable lens is an interchangeable lens that does not support the protocol in the camera system shown in this example. In this case, to avoid a situation where the camera control unit 8 is unable to refer to the offset information and image circle diameter information described above, the memory unit 11 of the main body 1 stores information corresponding to each interchangeable lens. The information held by the memory units 11 and 14 is used to optimize image stabilization in the camera system shown in this example. Details of the control will be described later.

The image sensor 6 is driven and controlled (moved or rotated) by the image shake correction unit 7 with the center of the mount unit 5 as a reference. In the drive control, the camera control unit 8 can change the image circle center of the lens device 2 to a reference position based on the maximum offset information of the image circle center notified from the lens control unit 13. In other words, image quality can be improved by aligning the center of the image sensor 6 with the image circle center based on the maximum offset information of the image circle center. On the other hand, if the process of aligning the center of the image sensor 6 with the image circle center is not performed, the balance of the light amount at the four corners of the captured image may be lost due to a decrease in peripheral light amount. In this embodiment, the light amount balance is guaranteed by performing the process of aligning the center of the image sensor 6 with the image circle center, and deterioration of image quality can be suppressed.

Next, we will explain the optimization of image stabilization control in a camera system. Figure 2 is a conceptual diagram showing a camera system. Figure 2(A) shows a state in which a lens device 2(a) is attached to a main body unit 1, and Figure 2(B) shows a state in which a lens device 2(b) is attached to a main body unit 1. Lens devices 2(a) and 2(b) are interchangeable lenses with different characteristics, and are distinguished by the alphabetical letters written in parentheses.

The lens device 2(a) shown in FIG. 2(A) is attached to the main body 1 via the mount 5. The lens device 2(a) has a memory 14, which holds the maximum offset information of the image circle center, image circle diameter information, and an identification number for notifying the main body 1 that it is the lens device 2(a). The identification number ID of the lens device 2(a) is represented as "AAA". As the maximum offset information of the image circle center, the error amount at the time of manufacture (individual offset information unique to the device) is represented as "ICi". As the image circle diameter information, the design nominal value (design image circle diameter) is represented as "ICd". "YES" shown in FIG. 2(A) means that the memory 14 stores data on ICi and ICd. The data on ICi and ICd stored in the memory 14 of the lens device 2(a) are acquired by the camera control unit 8 and the image blur correction control unit 9 of the main body 1 via the lens control unit 13. The image stabilization control unit 9 of the main body 1 uses the acquired data to control the drive of the image sensor 6 within a stroke range appropriate for the lens device 2(a), with the position at which the individual offset information "ICi" is cancelled as the reference position. The method for determining the stroke range will be described later with reference to FIG. 3(A).

Lens device 2(b) shown in FIG. 2(B) is attached to main body 1 via mount 5. Lens device 2(b) has memory 14, which holds image circle diameter information and an identification number. The identification number ID for notifying main body 1 that it is lens device 2(b) is represented as "BBB." "YES" shown in FIG. 2(B) means that memory 14 stores data for ICd, and "NO" means that memory 14 does not store data for ICi.

The lens device 2(b) is an interchangeable lens manufactured to be optimized for a camera system (hereinafter referred to as system B) different from the lens device 2(a). On the other hand, the lens device 2(a) is an interchangeable lens that complies with the camera system (hereinafter referred to as system A) of FIG. 1. Therefore, when the lens device 2(b) is attached to the main body 1 and used, the main body 1 cannot perform processing that can be performed by the lens device 2(a) that complies with system A. For example, it is impossible to change the reference position of the image sensor 6 according to the individual offset information ICi or calculate the minimum image circle diameter described later. However, even with an interchangeable lens that complies with system B, there are cases where the minimum image circle margin shown below can be secured at the design stage. In this case, image blur correction can be performed with an image blur correction stroke based on the minimum image circle margin, the effective imaging range of the image sensor 6, and the positioning accuracy of the image blur correction unit 7. With reference to FIG. 3, the calculation process of the image blur correction stroke (drive control amount) in this embodiment will be described.

3A is a conceptual diagram of the lens device 2(a) mounted on the main body 1, showing the positional relationship when viewed from the optical axis direction of the imaging optical system 3. The circle shown by the thick solid line in FIG. 3A represents the position of the individual image circle. The circle shown by the dashed line represents the position of the design image circle. In other words, the individual image circle diameter (see the thick solid line) is represented as a circle to which the circle representing the design image circle diameter is moved by the individual offset information ICi (see the arrow). The rectangle shown by the dashed line in FIG. 3A represents the effective imaging range of the imaging element 6 positioned with the positioning accuracy of the image blur correction unit 7, with the center of the mount unit 5 as the reference. The center of the mount unit 5 corresponds to the intersection of the crosshairs shown by the dashed line (thick line). The positioning accuracy is the accuracy when the imaging element 6 is positioned at the center of the mount unit 5 by the image blur correction unit 7 when viewed from the optical axis direction of the imaging optical system. The positioning accuracy is stored as data in the storage unit 11, or is used as a predetermined accuracy as the limit amount of manufacturing error specified in the camera system. Information on the effective imaging range of the image sensor 6 is held by the camera control unit 8 or the memory unit 11. The rectangle indicated by the solid line in FIG. 3(A) indicates the effective imaging range of the image sensor 6 positioned at a position that cancels the individual offset information ICi (see arrow). The individual offset removal position is the position of the intersection of the crosshairs indicated by the dashed and dotted lines (thin lines).

In FIG. 3A, the image blur correction stroke is represented by the image circle margin s(a). This s(a) is the amount expressed on one side of the amplitude of the drive signal for image blur correction (it is twice that amount in the range covering the entire amplitude of the drive signal). The image circle margin s(a) is the length obtained by subtracting the diagonal radius (half the diagonal length) of the rectangle showing the effective imaging range of the image sensor 6 and the positioning accuracy of the image blur correction unit 7 from half (radius) of the design image circle diameter ICd. Alternatively, the image circle margin s(a) is the length obtained by subtracting the diagonal radius of the rectangle showing the effective imaging range of the image sensor 6, which has been positioned based on the individual offset information ICi, and the positioning accuracy of the image blur correction unit 7 from the individual image circle radius.

Lens device 2(a) is an interchangeable lens that conforms to system A and stores information that satisfies all of the predetermined protocols. The image circle margin s(a) corresponding to lens device 2(a) is designed to be a sufficient value for the focal length of lens device 2(a) and the expected amount of camera shake, etc.

Figure 3(B) is a conceptual diagram for explaining the calculation of the minimum image circle diameter and the minimum image circle margin, showing the positional relationship when viewed from the optical axis direction of the imaging optical system. In Figure 3(B), the minimum image circle diameter is represented by a thick solid circle, and the design image circle diameter is represented by a thin solid circle. The individual image circle position is represented by a dashed circle. The minimum image circle diameter is calculated in the camera control unit 8. The minimum image circle diameter (thick solid circle) is represented by a circle whose radius is the closest distance to the center of the mount unit 5 from the circle (dashed circle) to which the design image circle diameter (thin solid circle) has moved by the individual offset information ICi (see arrow). In other words, the minimum image circle diameter is smaller than the design image circle diameter. The center of the mount unit 5 corresponds to the intersection of the cross lines shown by the dashed line (thick line). The rectangle shown by the solid line in Figure 3(B) represents the effective imaging range of the imaging element 6. It is desirable to perform drive control of the imaging element 6 without the rectangle representing the effective imaging range going beyond the circle representing the minimum image circle diameter.

In FIG. 3B, the image blur correction stroke is represented by the minimum image circle margin s(b). This s(b) is the amount expressed on one side of the drive signal amplitude of the image blur correction (it is twice that amount in the range of the overall amplitude of the drive signal). More specifically, the image blur correction stroke of the lens device 2(b) is the difference amount obtained by subtracting the diagonal radius (half the diagonal length) of the rectangle indicating the effective imaging range of the image sensor 6 and the positioning accuracy of the image blur correction unit 7 from the minimum image circle radius. With regard to this image blur correction stroke, it is possible that the lens device 2(b) cannot necessarily expect a sufficient image blur correction effect in terms of the relationship between the camera shake of the imaging device and the focal length. However, by performing image blur correction within the range of this image blur correction stroke, it is possible to exert the image blur correction effect while suppressing extreme deterioration due to light reduction in the four corners of the image. Also, if the lens device 2(b) does not have an image blur correction lens, the image blur correction effect is exerted by driving and controlling the image sensor 6 in the main body 1.

Figure 4 is a flowchart explaining the process of determining the image blur correction stroke of the image blur correction unit 7 in this embodiment. The process shown below is started when the lens device is attached to the main body unit 1, or when the imaging system 1000 is turned on.

In S001 of FIG. 4, the camera control unit 8 executes a process of identifying the lens device attached to the main body unit 1. For example, the memory unit of the lens device 2(a) stores "AAA" as the identification number ID, and the memory unit of the lens device 2(b) stores "BBB" as the identification number ID. The camera control unit 8 judges whether the memory unit of the lens device stores an identification number for identifying the lens device. If it is judged that the memory unit of the lens device does not store an identification number, it is unclear whether the minimum image circle margin can be secured for that lens device. Therefore, a separate process is performed. The separate process is, for example, a process of determining the image blur correction stroke without judging whether the camera control unit 8 can secure the minimum image circle margin. The camera control unit 8 refers to focal length information, etc., specified by the photographer, and performs a process of allocating the image blur correction stroke within a range in which the light reduction (reduction in peripheral light amount) level at the four corners of the image does not exceed a threshold value.

In S002, the camera control unit 8 judges the information stored in the memory unit 14 of the lens device attached to the main body unit 1. If it is judged that the memory unit 14 stores information related to the image circle, such as the design image circle diameter ICd and the individual offset information ICi, the process proceeds to S004. If it is judged that the memory unit 14 does not store information related to the image circle, the process proceeds to S003.

In S003, the camera control unit 8 refers to information related to the image circle of an interchangeable lens that complies with another system (for example, system B) stored in the storage unit 11. After S002 or S003, the process proceeds to S004, where the camera control unit 8 calculates and determines the image blur correction stroke from the image circle margin by the method described with reference to FIG. 3. For example, when the lens device 2(a) shown in FIG. 2(A) is attached, the image blur correction stroke range (see arrow SA) calculated from twice the image circle margin s(a) is determined. Also, when the lens device 2(b) shown in FIG. 2(B) is attached, the image blur correction stroke range (see arrow SB) calculated from twice the minimum image circle margin s(b) is determined. In this case, the image blur correction stroke range when the lens device 2(b) is attached is narrower than the image blur correction stroke range when the lens device 2(a) is attached.

After S004, the series of processes ends. After this, the image stabilization control unit 9 of the main body 1 controls the drive of the image sensor 6 within the image stabilization stroke range determined in S004, and an image with image stabilization is obtained.

The memory unit 11 or memory unit 14 in this embodiment stores image circle diameter information, maximum offset information of the image circle center, or offset information of the optical axis of the imaging optical system for each lens device. For example, for image circle diameter information and maximum offset information of the image circle center, multiple pieces of data corresponding to the focus state, zoom state, or aperture value of the imaging optical system are stored in the memory unit. The focus state is a state corresponding to the position of the focus lens or focus detection information, and the zoom state is a state corresponding to the position of the zoom lens, shooting magnification, shooting angle of view, etc. The camera control unit 8 can obtain information required for processing from the memory unit 11 or memory unit 14 depending on the shooting conditions.

Alternatively, the memory unit 11 or the memory unit 14 stores the image circle diameter information and the maximum offset information of the image circle center as data that is not dependent on the focus state, zoom state, or aperture value of the imaging optical system. In this case, the camera control unit 8 can obtain a single value from the memory unit 11 or the memory unit 14 regardless of the focus state, zoom state, or aperture value of the imaging optical system, thereby simplifying the processing.

When the information stored in the memory unit of the lens device is insufficient for the information required for image blur correction, the camera control unit 8 searches for and uses information corresponding to the identification information of the lens device from the memory unit 11. The identification information of the lens device is ID information stored in the memory unit of the lens device, or information indicating the identification result of the type of lens device when the main unit performs the identification process of the lens device. The latter information can be obtained by the camera control unit 8 from information indicating the specifications of the lens device attached to the main unit, information of the lens device input or selected by the user, etc. For example, the camera control unit 8 obtains maximum offset information of the image circle center or offset information of the optical axis of the imaging optical system from the memory unit 11 based on the identification information of the lens device, and calculates the minimum image circle diameter. The camera control unit 8 calculates the minimum image circle margin, which is the length obtained by subtracting the diagonal length of the imaging range of the imaging element from the minimum image circle diameter. The range of the drive control amount of the image blur correction unit 7 is determined by the difference between the minimum image circle margin and the positioning accuracy of the imaging element 6.

This embodiment can be used not only when a lens device 2(a) conforming to system A, which is an imaging system of this embodiment, is attached to the main body 1, but also when a lens device 2(b) conforming to a different system B is attached to the main body 1. Information required for image stabilization is notified from the lens device to the main body 1, or is stored in the memory unit 11 of the main body 1. When viewed from the optical axis direction of the imaging optical system, a length is calculated by subtracting the diagonal length related to the imaging range of the imaging element 6 from the length equivalent to the image circle diameter based on the center of the mount unit 5. The difference between the calculated length and the positioning accuracy when the imaging element 6 is positioned at the center of the mount unit 5 can be calculated to determine the range of the drive control amount for image stabilization.

According to this embodiment, even when a lens device and a camera body that comply with different systems are combined, image stabilization can be achieved with an appropriate amount of drive control without compromising image quality.

Reference Signs List 1: Main body 2: Lens device 5: Mount 7: Image blur correction unit 8: Camera control unit 9: Image blur correction control unit 11: Storage unit of main body 13: Lens control unit 14: Storage unit of lens device

Claims (6)

An imaging device to which a lens device can be attached via a mount portion,
a correction unit that performs image blur correction by driving an image sensor;
a control unit that controls the drive of the correction unit based on detection information from a detection unit that detects a shake of the lens device or the imaging device;
A storage means,
an imaging device characterized in that, when the control means cannot obtain maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device, the control means determines a range of a drive control amount of the correction means based on a difference between a length obtained by subtracting a diagonal length related to the imaging range of the image element from a length equivalent to the closest distance from a circle representing an image circle having an image circle diameter corresponding to the lens device, which is assumed to have an image circle center at a position corresponding to the information pre-stored in the storage means, when viewed from the optical axis direction of the imaging optical system of the lens device, to the center of the mount section, and a positioning accuracy when the image element is positioned at the center of the mount section by the correction means; and the control means determines a range of a drive control amount of the correction means when the control means can obtain maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device compared to when the control means cannot obtain maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device . 2. The imaging device according to claim 1, wherein, when the control means is able to acquire maximum offset information of an image circle center of the lens device and image circle diameter information from the lens device, it determines a range of a drive control amount of the correction means based on a difference between the positioning accuracy and a length obtained by subtracting the diagonal length from the image circle diameter indicated by the acquired image circle diameter information when viewed from an optical axis direction of an imaging optical system of the lens device. 3. The imaging device according to claim 1, wherein the storage unit stores image circle diameter information corresponding to the lens device from which the image circle diameter information cannot be acquired. 4. The imaging device according to claim 1, wherein the control means determines a range of a drive control amount of the correction means based on focal length information specified by a user when information for identifying the lens device cannot be acquired from the lens device. An imaging system including a lens device and an imaging device to which the lens device can be attached via a mount unit,
The imaging device includes:
a correction unit that performs image blur correction by driving an image sensor;
a control unit that controls the drive of the correction unit based on detection information from a detection unit that detects a shake of the lens device or the image pickup device,
The control means controls the drive of the correction means by changing the size of the range of the drive control amount of the correction means between a case where the maximum offset information of the image circle center of the lens device and the image circle diameter information of the lens device cannot be acquired from the lens device and a case where the maximum offset information of the image circle center of the lens device and the image circle diameter information of the lens device can be acquired from the lens device.
1. An imaging system comprising: A control method executed in an imaging device to which a lens device can be attached via a mount unit, comprising:
a determination step of determining a range of a drive control amount of a correction unit included in the imaging device by a control unit acquiring detection information of a detection unit that detects a shake of the lens device or the imaging device;
and performing image blur correction by driving an image sensor included in the imaging device by the correction means in accordance with the drive control amount,
a control means for controlling an imaging device, the control means determining a range of a drive control amount of the correction means based on a difference between a length obtained by subtracting a diagonal length related to an imaging range of the imaging element from a length equivalent to the closest distance from a circle representing an image circle having an image circle diameter corresponding to the lens device, the image circle center of which is assumed to be located at a position corresponding to information previously stored in a storage means of the imaging device, when viewed from a direction of an optical axis of an imaging optical system of the lens device, to the center of the mount section, the length being obtained by subtracting a diagonal length related to an imaging range of the imaging element, and the positioning accuracy when the imaging element is positioned at the center of the mount section by the correction means, and determining a range of a drive control amount of the correction means when the control means can obtain the maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device, compared to when the control means cannot obtain the maximum offset information and image circle diameter information of the image circle center of the lens device from the lens device .

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